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National UFO Reporting Center Sighting Report
Occurred : 12/8/2007 05:30 (Entered as : 12/08/07 5:30)
Reported: 1/27/2008 11:19:20 AM 11:19
Posted: 3/4/2008
Location: Burlington, CO
Shape: Flash
Duration: 5 seconds
Nearing Burlington, CO predawn on Dec 8, 2007 the entire horizon lit up in a huge semi-circular flash of purple

We did not actually see a UFO, however, my 3 children and I were driving west on I-70 through a snowstorm nearing the Burlington exit when suddenly there was a loud (ear-splitting) burst similar to the thunder that accompanies a lightning storm; the entire horizon lit up in a huge semi-circular flash of purple light.

We wondered if it was an explosion, some power lines having fallen or something, but saw nothing afterwards such as fire or emergency vehicles.

When we arrived at the Denny's shortly thereafter, the waitress admitted she had witnessed the exact same phenomenon.